cloudflared-mirror/ingress/origin_service.go

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package ingress
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"sync"
"time"
"github.com/cloudflare/cloudflared/hello"
"github.com/cloudflare/cloudflared/logger"
"github.com/cloudflare/cloudflared/socks"
"github.com/cloudflare/cloudflared/tlsconfig"
"github.com/cloudflare/cloudflared/websocket"
gws "github.com/gorilla/websocket"
"github.com/pkg/errors"
)
// OriginService is something a tunnel can proxy traffic to.
type OriginService interface {
// RoundTrip is how cloudflared proxies eyeball requests to the actual origin services
http.RoundTripper
String() string
// Start the origin service if it's managed by cloudflared, e.g. proxy servers or Hello World.
// If it's not managed by cloudflared, this is a no-op because the user is responsible for
// starting the origin service.
start(wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error
}
// unixSocketPath is an OriginService representing a unix socket (which accepts HTTP)
type unixSocketPath struct {
path string
transport *http.Transport
}
func (o *unixSocketPath) String() string {
return "unix socket: " + o.path
}
func (o *unixSocketPath) start(wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
transport, err := newHTTPTransport(o, cfg)
if err != nil {
return err
}
o.transport = transport
return nil
}
func (o *unixSocketPath) RoundTrip(req *http.Request) (*http.Response, error) {
return o.transport.RoundTrip(req)
}
func (o *unixSocketPath) Dial(reqURL *url.URL, headers http.Header) (*gws.Conn, *http.Response, error) {
d := &gws.Dialer{
NetDial: o.transport.Dial,
NetDialContext: o.transport.DialContext,
TLSClientConfig: o.transport.TLSClientConfig,
}
reqURL.Scheme = websocket.ChangeRequestScheme(reqURL)
return d.Dial(reqURL.String(), headers)
}
// localService is an OriginService listening on a TCP/IP address the user's origin can route to.
type localService struct {
// The URL for the user's origin service
RootURL *url.URL
// The URL that cloudflared should send requests to.
// If this origin requires starting a proxy, this is the proxy's address,
// and that proxy points to RootURL. Otherwise, this is equal to RootURL.
URL *url.URL
transport *http.Transport
}
func (o *localService) Dial(reqURL *url.URL, headers http.Header) (*gws.Conn, *http.Response, error) {
d := &gws.Dialer{TLSClientConfig: o.transport.TLSClientConfig}
// Rewrite the request URL so that it goes to the origin service.
reqURL.Host = o.URL.Host
reqURL.Scheme = websocket.ChangeRequestScheme(o.URL)
return d.Dial(reqURL.String(), headers)
}
func (o *localService) address() string {
return o.URL.String()
}
func (o *localService) start(wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
transport, err := newHTTPTransport(o, cfg)
if err != nil {
return err
}
o.transport = transport
// Start a proxy if one is needed
staticHost := o.staticHost()
if originRequiresProxy(staticHost, cfg) {
if err := o.startProxy(staticHost, wg, log, shutdownC, errC, cfg); err != nil {
return err
}
}
return nil
}
func (o *localService) startProxy(staticHost string, wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
// Start a listener for the proxy
proxyAddress := net.JoinHostPort(cfg.ProxyAddress, strconv.Itoa(int(cfg.ProxyPort)))
listener, err := net.Listen("tcp", proxyAddress)
if err != nil {
log.Errorf("Cannot start Websocket Proxy Server: %s", err)
return errors.Wrap(err, "Cannot start Websocket Proxy Server")
}
// Start the proxy itself
wg.Add(1)
go func() {
defer wg.Done()
streamHandler := websocket.DefaultStreamHandler
// This origin's config specifies what type of proxy to start.
switch cfg.ProxyType {
case socksProxy:
log.Info("SOCKS5 server started")
streamHandler = func(wsConn *websocket.Conn, remoteConn net.Conn, _ http.Header) {
dialer := socks.NewConnDialer(remoteConn)
requestHandler := socks.NewRequestHandler(dialer)
socksServer := socks.NewConnectionHandler(requestHandler)
socksServer.Serve(wsConn)
}
case "":
log.Debug("Not starting any websocket proxy")
default:
log.Errorf("%s isn't a valid proxy (valid options are {%s})", cfg.ProxyType, socksProxy)
}
errC <- websocket.StartProxyServer(log, listener, staticHost, shutdownC, streamHandler)
}()
// Modify this origin, so that it no longer points at the origin service directly.
// Instead, it points at the proxy to the origin service.
newURL, err := url.Parse("http://" + listener.Addr().String())
if err != nil {
return err
}
o.URL = newURL
return nil
}
func (o *localService) String() string {
return o.address()
}
func (o *localService) RoundTrip(req *http.Request) (*http.Response, error) {
// Rewrite the request URL so that it goes to the origin service.
req.URL.Host = o.URL.Host
req.URL.Scheme = o.URL.Scheme
return o.transport.RoundTrip(req)
}
func (o *localService) staticHost() string {
addPortIfMissing := func(uri *url.URL, port int) string {
if uri.Port() != "" {
return uri.Host
}
return fmt.Sprintf("%s:%d", uri.Hostname(), port)
}
switch o.URL.Scheme {
case "ssh":
return addPortIfMissing(o.URL, 22)
case "rdp":
return addPortIfMissing(o.URL, 3389)
case "smb":
return addPortIfMissing(o.URL, 445)
case "tcp":
return addPortIfMissing(o.URL, 7864) // just a random port since there isn't a default in this case
}
return ""
}
// HelloWorld is an OriginService for the built-in Hello World server.
// Users only use this for testing and experimenting with cloudflared.
type helloWorld struct {
server net.Listener
transport *http.Transport
}
func (o *helloWorld) String() string {
return "Hello World test origin"
}
// Start starts a HelloWorld server and stores its address in the Service receiver.
func (o *helloWorld) start(wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
transport, err := newHTTPTransport(o, cfg)
if err != nil {
return err
}
o.transport = transport
helloListener, err := hello.CreateTLSListener("127.0.0.1:")
if err != nil {
return errors.Wrap(err, "Cannot start Hello World Server")
}
wg.Add(1)
go func() {
defer wg.Done()
_ = hello.StartHelloWorldServer(log, helloListener, shutdownC)
}()
o.server = helloListener
return nil
}
func (o *helloWorld) RoundTrip(req *http.Request) (*http.Response, error) {
// Rewrite the request URL so that it goes to the Hello World server.
req.URL.Host = o.server.Addr().String()
req.URL.Scheme = "https"
return o.transport.RoundTrip(req)
}
func (o *helloWorld) Dial(reqURL *url.URL, headers http.Header) (*gws.Conn, *http.Response, error) {
d := &gws.Dialer{
TLSClientConfig: o.transport.TLSClientConfig,
}
reqURL.Host = o.server.Addr().String()
reqURL.Scheme = "wss"
return d.Dial(reqURL.String(), headers)
}
func originRequiresProxy(staticHost string, cfg OriginRequestConfig) bool {
return staticHost != "" || cfg.BastionMode
}
// statusCode is an OriginService that just responds with a given HTTP status.
// Typical use-case is "user wants the catch-all rule to just respond 404".
type statusCode struct {
resp *http.Response
}
func newStatusCode(status int) statusCode {
resp := &http.Response{
StatusCode: status,
Status: http.StatusText(status),
Body: new(NopReadCloser),
}
return statusCode{resp: resp}
}
func (o *statusCode) String() string {
return fmt.Sprintf("HTTP %d", o.resp.StatusCode)
}
func (o *statusCode) start(wg *sync.WaitGroup, log logger.Service, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
return nil
}
func (o *statusCode) RoundTrip(_ *http.Request) (*http.Response, error) {
return o.resp, nil
}
type NopReadCloser struct{}
// Read always returns EOF to signal end of input
func (nrc *NopReadCloser) Read(buf []byte) (int, error) {
return 0, io.EOF
}
func (nrc *NopReadCloser) Close() error {
return nil
}
func newHTTPTransport(service OriginService, cfg OriginRequestConfig) (*http.Transport, error) {
originCertPool, err := tlsconfig.LoadOriginCA(cfg.CAPool, nil)
if err != nil {
return nil, errors.Wrap(err, "Error loading cert pool")
}
httpTransport := http.Transport{
Proxy: http.ProxyFromEnvironment,
MaxIdleConns: cfg.KeepAliveConnections,
MaxIdleConnsPerHost: cfg.KeepAliveConnections,
IdleConnTimeout: cfg.KeepAliveTimeout,
TLSHandshakeTimeout: cfg.TLSTimeout,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: &tls.Config{RootCAs: originCertPool, InsecureSkipVerify: cfg.NoTLSVerify},
}
if _, isHelloWorld := service.(*helloWorld); !isHelloWorld && cfg.OriginServerName != "" {
httpTransport.TLSClientConfig.ServerName = cfg.OriginServerName
}
dialer := &net.Dialer{
Timeout: cfg.ConnectTimeout,
KeepAlive: cfg.TCPKeepAlive,
}
if cfg.NoHappyEyeballs {
dialer.FallbackDelay = -1 // As of Golang 1.12, a negative delay disables "happy eyeballs"
}
// DialContext depends on which kind of origin is being used.
dialContext := dialer.DialContext
switch service := service.(type) {
// If this origin is a unix socket, enforce network type "unix".
case *unixSocketPath:
httpTransport.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) {
return dialContext(ctx, "unix", service.path)
}
// Otherwise, use the regular network config.
default:
httpTransport.DialContext = dialContext
}
return &httpTransport, nil
}